From CNN’s Claudia Rebaza in London
WikiLeaks does not know where Julian Assange is right now, a WikiLeaks source told CNN.
Relations inside the Ecuadorian embassy have been deteriorating for months.
It has been seven years since Julian Assange fled to the country's diplomatic mission in Knightsbridge, yards from the world-famous Harrods department store, facing extradition to Sweden on sexual assault allegations that he denied.
Thursday's arrest perhaps comes as little surprise after WikiLeaks held a press conference earlier this week accusing staff at the Ecuadorian embassy of spying on him.
Since Ecuadorian President Lenin Moreno took office in 2017, Assange had repeatedly claimed his living situation within the embassy was becoming increasingly hostile, with the country trying to make life more difficult in a bid to force him to vacate the premises.
Ecuador has consistently denied Assange's allegations.
From CNN’s Gianluca Mezzofiore in London
Moments after news of Julian Assange's arrest broke, British Home Secretary Sajid Javid tweeted thanks to Ecuador for their cooperation.
The first photographs showing the arrest of Julian Assange in central London on Thursday have started to cross.
Here's the full statement from London's Metropolitan Police on the arrest of Assange:
Julian Assange, 47, (03.07.71) has today, Thursday 11 April, been arrested by officers from the Metropolitan Police Service (MPS) at the Embassy of Ecuador, Hans Crescent, SW1 on a warrant issued by Westminster Magistrates' Court on 29 June 2012, for failing to surrender to the court.
He has been taken into custody at a central London police station where he will remain, before being presented before Westminster Magistrates' Court as soon as is possible.
The MPS had a duty to execute the warrant, on behalf of Westminster Magistrates' Court, and was invited into the embassy by the Ambassador, following the Ecuadorian government's withdrawal of asylum.
Julian Assange, the 47-year-old WikiLeaks founder, has been arrested in London.
London's Metropolitan Police confirmed Assange's arrest on Twitter on Thursday morning.
Assange had been living in the Ecuadorian Embassy in central London in 2012 while wanted for questioning over sexual assault allegations in Sweden.
The Swedish case may have since been shelved but he was still wanted by British authorities for jumping bail.
Assange maintained his innocence and claimed the charges were nothing more than an attempt to extradite him to the United States.
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